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= (54) Title: LASER BEAM MACHINING METHOD 

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(57) Abstract: The invention provides a laser beam machining 
method characterized by comprising the steps of mounting a 
protective tape (25) on the surface (3) of a wafer (la), radiating 
laser light (L) by using the back (21) of a wafer (la) as a laser light 
incidence plane with an optical converging point (P) positioned in 
a substrate (15) to thereby form a melt processing region (13) for 
melt processing by multiphoton absorption, forming, by means of 
the melt processing region (13), a cutting start region (8) on the side 
within a predetermined distance from the laser light incidence plane 
along a predetermined cutting line (5) on the wafer (la), mounting 
an expand tape (23) on the back (21) of the wafer (la), and stretching 
the expand tape (23) to thereby separate a plurality of chip-like 
portions (24) from each other that are formed by the wafer (la) being 
cut with the cutting start region (8) used as the starting point. 

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TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, YU, 
ZA, ZM, ZW. 

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INTERNATIONAL SEARCH REPORT 



International application No. 

PCT/JP03/11626 



A. CLASSIFICATION OF SUBJECT MATTER 

Int. CI 7 H01L21/301, B28D5/00, B23K26/38, B23K101:40 



According to International Patent Classification (IPQ or to both national classification and IPC 
B. FIELDS SEARCHED 

Minimum documentation searched (classification system followed by classification symbols) 

Int. CI 7 H01L21/301, B28D5/00, B23K26/38, B23K101:40 



Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched 
Jitsuyo Shinan Kbho 1922-1996 Toroku Jitsuyo Shinan Kbho 1994-2003 

Kokai Jitsuyo Shinan Koho 1971-2003 Jitsuyo Shinan Toroku Kbho 1996-2003 

Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) 



C. DOCUMENTS CONSIDERED TO BE RELEVANT 



Category* 



Citation of document, with indication, where appropriate, of the relevant passages 



Relevant to claim No. 



JP 2002-192370 A (Hamamatsu Photonics Kabushiki 
Kaisha) , 

10 July, 2002 (i0. 07.02), 
Full text; all drawings 
& EP 1338371 Al 

JP 9-17756 A (Toshiba Corp.), 
17 January, 1997 (17.01.97), 
Par. Nos. [0002], [0026] to [0034] 
(Family: none) 

JP 2002-226796 A (Hitachi Chemical Co., Ltd.), 
14 August, 2002 (14.08.02), 
Par. No. [0112]; Fig. 6 
(Family: none) 



1-9 



1-9 



1-9 



fx] Further documents are listed in the continuation of Box C. [^] See patent family annex. 



* Special categories of cited documents: i 
"A" document defining the general state of the art which is not 

considered to be of particular relevance 
"IT earlier document but published on or after the international filing "X" 

date 

"L" document which may throw doubts on priority claim(s) or which is 

cited to establish the publication date of another citation or other "Y" 
special reason (as specified) 

a O" document referring lo an oral disclosure, use, exhibition or other 
means 

"P" document published prior to the international filing date but later 



later document published after the international filing date or 
priority date and not in conflict with the application but cited to 
understand the principle or theory underlying the invention 
document of particular relevance; the claimed invention cannot be 
considered novel or cannot be considered to involve an inventive 
step when the document is taken alone 

document of particular relevance; the claimed invention cannot be 
considered to involve an inventive step when the document is 
combined with one or more other such documents, such 
combination being obvious to a person skilled in the art 
document member of the same patent family 



Date of the actual completion of the international search 
17 December, 2003 (17.12.03) 


Date of mailing of the international search report 

13 January, 2004 (13.01.04) 


Name and mailing address of the ISA/ 

Japanese Patent Office 

Facsimile No. 


Authorized officer 
Telephone No. 



Form PCT/ISA/210 (second sheet) (July 1998) 



INTERNATIONAL SEARCH REPORT 



International application No. 

PCT/JP03/11626 



C (Continuation). DOCUMENTS CONSIDERED TO BE RELEVANT 


Category* 


Citation of document, with indication, where appropriate, of the relevant passages 


Relevant to claim No. 


Y 


JP 7-37840 A (NEC Corp.)/ 
07 February, 1995 (07.02.95) , 
Par. Nos. [0014] to [0019] 
(Family: none) 


1-9 


| Y 


JP 60-55640 A (Sanyo Electric Co., Ltd.), 
30 March, 1985 (30.03.85), 
Page 2, upper right column, lines 1 to 18 
(Family: none) 


1-9 


A 


JP 11-221684 A (Hamamatsu Photonics Kabushiki 
Kaisha) , 

17 August, 1999 (17.08.99), 
(Family: none) 


1-9 



Form PCT/ISA/210 (continuation of second sheet) (July 1998) 



SB£fcBJiI## PCT/J P 0 3/1 1 6 26 



A. &W<om-t%&W'<Dftm (BKtfNF&jH (IPC) ) 

Int. CI 7 H01L21/301 B28D5/00 B23K26/38 B23K101 :40 



B. ^gfejTofc^g 

W*fcfTofc*/hRjm (HRWIWMK (IPC) ) 

Int. CI 7 H01L21/301 B28D5/00 B23K26/38 B23K101 :40 



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Y 
Y 


JP 2002-192370 A h *ifc£#tfc) 2 0 
0 2. 0 7. 1 0, £X & EP 1338371 Al 

JP 9-17756 A (ttS*£rttJ|C3£) 1997. 01. 17, 
[0002], 100261 -[0034] (775!)^l) 

JP 2002-226796 A ( 0 Stffcfifcl3i68nS£*|fc) 2 0 0 
2. 08. 14, [0112], HI 6 (7r$9-4L) 


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JP 7-37840 A (B#** *^|fc) 1 9 9 5. 0 2. 
7, [0 0 1 4] - [0 0 1 9] 

JP 60-55640 A (H#m^l^#l±) 1 9 8 5. 0 3. 

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JP 11-221684 A h = 1 9 9 

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